Garlic was an Earth vegetable.
Vampires suffered adverse effects in the presence of garlic due to an allergy to its allyl component. The vampires and humans of the so-called "vampire planet" in E-Space referred to it as garil. The Fourth Doctor was rather fond of garlic. (PROSE: The Eight Doctors)
Garlic was used as an ingredient in garlic bread, which Iris Wildthyme ate until she found she disliked it. (AUDIO: Wildthyme at Large)
Garlic had a strong smell. When Starkey was forced to huddle up to Thorne to be transported from Urlic back to Earth, Starkey asked Thorne if he had been eating "onions, or garlic". (TV: Lost Library of Ukko)
The Seventh Doctor once gave Nathan li Shao a chocolate-coated liquorice that was garlic- and spam-flavoured. (PROSE: Sky Pirates!)
Rhys Williams recalled that he had his first kiss with Gwen Cooper in supermarket; they were in a queue when Rhys told her that he did not want to make spaghetti bolognese as it contained garlic and he could not kiss her with "garlic breath", upon which Gwen laughed, called him "Rhys the Rant" and kissed him right there in the queue. (TV: Adam)
According to the Thirteenth Doctor, spiders hated the smell of garlic, as well as the acetic acid found in vinegar. (TV: Arachnids in the UK)